Water-in-volatile silicone emulsifier concentrates

Abstract

Water-in-volatile silicone emulsifier concentrates containing 2 to 30 wt. % water in the internal phase, 40 to 90 wt. % of a volatile cyclic silicone liquid such as the octamethylsiloxane cyclic tetramer, decamethylsiloxane cyclic pentamer or the dodecamethylsiloxane cyclic hexamer and 5 to 40 wt. % of a polyoxyalkylene substituted silicone containing per molecule 5 to 100 dialkylsiloxy units, two trialkylsiloxy end blocking units and 1 to 16 polyoxyalkylene substituted alkylsiloxy units of the average formula: ##STR1## in which R is an alkyl group having 1 to 4 carbon atoms and R can individually be the same or different, wherein R° is a terminal group selected from the class consisting of hydrogen, alkyl, aryl, aralkyl and acyl radicals, n is an integer of 2 to 8, a is a number of 5 to 20 and b is 2 or 3. Said emulsifier concentrates are highly useful in preparing water-in-silicone personal-care emulsions by simply mixing same with desired personal-care components soluble therein followed by mixing with water in which water soluble personal-care components may be mixed. The personal-care components include the well known materials such as emollients, film formers, sun screen agents, moisture barriers, anti-perspirants and the like. Processes are also described for preparing the water-in-silicone emulsifier concentrates and emulsions mentioned above.

What is claimed is: 
     
       1. A water-in-silicone emulsifier concentrate providing greater than 90% light transmittance and which concentrate is used for mixing with water to form a water-in-silicone emulsion, said concentrate comprising: (a) 2 to 10 wt.% of water in an internal phase;   (b) 45 to 74 wt.% of a volatile cyclic silicone liquid in an external phase, said cyclic silicone liquid having a normal boiling point of less than 250° C. and having the formula:   [R.sub.2 Sio].sub.x        wherein R is alkyl having 1 to 4 carbon atoms and R can individually be the same or different and x is an integer of 4 to 6; and   (c) 16 to 40 wt.% of a polyoxyalkylene substituted and silicone having the average formula: MD y  D° z  M wherein M is a trialkylsiloxy unit having the formula R 3  Sio 0 .5, D is a dialkylsiloxy unit of the formula R 2  SiO, D°  is a polyoxyalkylene substituted alkylsiloxy unit of the average formula: ##STR7##  R is an alkyl group having 1 to 4 carbon atoms, R° is a terminal groups selected from the group consisting of alkyl, aryl, aralkyl and acyl radicals, n is an integer of 2 to 8, a is a number of 5 to 12, b is 2, y is a number of 10 to 100, z is a number of 1 to 16, said percentages being based on the total weight of (a), (b) and (c) wherein the polyoxyalkylene chain has a molecular weight less than 1000.   
     
     
       2. Water-in-silicone emulsifier concentrate as claimed in claim 1 wherein the polyoxyalkylene chain, (OC b  H 2b ) a , of said polyoxyalkylene substituted silicone contains an average of at least 50 wt. % polyoxyethylene units, the amount of water is 2 to 10 wt. %, the amount of cyclic silicone is 50 to 74 wt. % and the amount of polyoxyalkylene substituted silicone is 16 to 30 wt. %. 
     
     
       3. Water-in-silicone emulsifier concentrate as claimed in claim 2 wherein the amount of water is 2 to 10 wt. %, the amount of cyclic silicone is 60 to 74 wt. % and the amount of polyoxyalkylene substituted silicone is 16 to 28 wt. %. 
     
     
       4. Water-in-silicone emulsifier concentrate as claimed in claim 2 wherein said cyclic silicone liquid is octamethyltetrasiloxane and said polyoxyalkylene substituted silicone has the average formula: ##STR8## wherein y, z, b and a are as defined in claim 1. 
     
     
       5. Water-in-silicone emulsifier concentrate as claimed in claim 4 wherein said polyoxyalkylene substituted silicone has the average formula: ##STR9## 
     
     
       6. Water-in-silicone emulsifier concentrate as claimed in claim 5 containing about 10 wt. % water, about 74 wt. % dimethylsiloxane cyclic tetramer and about 16 wt. % of said polyoxyalkylene substituted silicone. 
     
     
       7. Water-in-silicone emulsifier concentrate as claimed in claim 2 wherein said cyclic silicone liquid is decamethylpentasiloxane and said polyoxyalkylene substituted silicone has the average formula: ##STR10## wherein y, z, b and a are as defined in claim 1. 
     
     
       8. Water-in-silicone emulsifier concentrate as claimed in claim 7 wherein said polyoxyalkylene substituted silicone has the average formula: ##STR11## and concentrate containing about 10 wt. % water, about 74 wt. % dimethylsiloxane cyclic pentamer and about 16 wt. % of said polyoxyalkylene substituted silicone.